title: Phase measurements on terahertz waves.
abstract: The change in phase of the free space terahertz (THz) electric field as a sample of material introduced into the THz beampath of a CW THz system is measured and used to calculate the index of refraction of materials at 250 GHz.
authors.forename: A H
authors.initials: AH
authors.lastname: Cordes
authors.forename: D H
authors.initials: DH
authors.lastname: Thomas
authors.forename: J P
authors.initials: JP
authors.lastname: von der Weid